Add a missing dependency for UpdatableSystemFontTest

All of a test's dependencies should be explicitly declared in the Soong build module to enable infrastructure features that ensure correctness and optimize runtime.

Here UpdatableSystemFontTest uses EmojiRenderingTestApp, but it doesn't declare the dependency in its Soong build module. This change declares EmojiRenderingTestApp in UpdatableSystemFontTest's `data` attribute.

Bug: 222438068
Test: atest-src UpdatableSystemFontTest \
          --experimental-device-driven-test \
          --experimental-java-runtime-dependencies \
          --bazel-arg=--test_timeout=48000
Test: atest UpdatableSystemFontTest
Change-Id: Ic1b5b94aabd4c95744109f2cc7443ae04c43b3a6